I wonder why was abortion taken off the table. Was it her decision, your decision, a mutually agreed to decision? If she's so intent on keeping the two of you on the right track then she won't make you be in this lie with her. She doesn't even have to tell the sperm donor about the pregnancy. What he doesn't know, won't hurt him.
Win/win all around. Personally, I think she's being rather selfish and she appeases her own guilt by continuing to reiterate how "sorry" she is that she let this happen while she expects you to be emotionally and financially responsible for another man's baby. Is your love for her that unconditional that you don't get to have a say in the decision when it's going to affect you for the rest of your life?
You should see a lawyer to find out what your responsibility will be for that child should the union dissolve once again. It's the least you can do for yourself.
Last edited by Wakeup; 10-10-14 at 07:39 AM.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion